writeline overwrites my file, instead of appending [resolved]

[joeframbach]

i have a list of accounts in a txt file that goes like this:
username
password
username
password
...and so on.
if a user makes a new account, i want it to append to the end of the file.
here is the code:

Dim sw As StreamWriter = New StreamWriter("users.txt")
sw.Write(name)
sw.Write(pass)
sw.Close()

but the text only erases my file and writes the name and pass